Process of making rivets



(No Model.)

0. W. KING.

PROCESS OF MAKING RIVETS.

No. 437,817. Patented Oct. 7,1890.

l/T/VEESES.

UNITED STATES PATENT OFFICE.

CHARLES TV. KING, OF NEIVTON, MASSACHUSETTS.

PROCESS OF MAKING RlVETS.

SPECIFICATION forming part of Letters Patent No. 437,817, dated October '7, 1890.

' Application filed March 25, 1890. Serial No. 345,194. (No model.)

To all whom it may concern.-

Be it known that I, CHARLES 7. KING, of Newton, county of Middlesex, State of Massachusetts, have invented certain new and useful Improvements in Rivets and the Process of Manufacturing the Same, of which the following description, taken in connection with the accompanying drawings, is a specificat-ion.

My invention has for its object to produce a slotted rivet quickly and cheaply; and it consists, more particularly, in the method of doing this, which is hereinafter described, and which is pointed out in the claim.

In the drawings, Figure 1 shows a section of wire or rod sufficient to form two rivet-s in position in the grippers and with the punching-die which slots the blank and the hammers or headers at either end thereof which act to head the rivets in position. Fig. 2 is a plan view with the punch removed, showing the formed rivets in the position in which they are formed and with the grippers and headers withdrawn. Fig. 3 is a completed rivet. Fig. a shows a blank for two rivets having a modified form of slot.

Slotted rivets are well known, but so far as known to me their production has been comparatively slow and expensive. 3y my improved process they may be produced with greater speed and considerably less expense. The method is simple and will be readily un derstood from the following description, in which reference is made to the accompanying drawings.

I use a continuous wire or rod of metal of the proper kind and quality, and this I divide into sectionsin any suitable manner, each section being of a size sufficient to form two rivets. One such section is shown at a, Fig. 1. This section or blank is then held between suitable gripping devices I), which may be constructed in any well-known manner to seize and hold the blank firmly. A plunger or male die 0, placed preferably directly above the blank as it is held in the grippers and reciprocated vertically in any well-known manner, co-operates with a female die d,situated below the blank. The plunger 0 is of the shape and size in horizontal cross-section of the piece which it is desired to cut from the blank. The plunger on its downward movement passes through the blank and cuts therefrom a single piece of the shape desired and at the same time severs the blank centrally, thus forming the bodies or points of two rivets, as will vbe clear. Simultaneous with the cutting operation, two headers or hammers fone ateither end of the blank-of well-known construction are used to upset the ends of the section of wire and form the heads of the rivets, as will be clear from Fig. 2. In this way two rivets are formed at one operation of the machine. As will be clear, the form of the plungeror punch a may be varied as desired. It should, however, be so shaped as to not only slot the rivets but to separate them.

A modified form of slot is shown, Fig. 4c, substantially rectangular in shape instead of being curved and rounded, as that shown in Fig. 2. The plunger used in cutting the form of slot shown, Fig. at, is provided with cutting projections placed centrally on either side thereof in order to separate the blank centrally when the slot is out, these projections corresponding with the lines of cut which appear at r, Fig. at. As will be clear, by employing a plunger of proper form a rivet slotted in any manner desired may be produced. The precise orderof the steps in slotting and heading the rivets is not essential.

The slotting and heading are preferably, as above stated, done simultaneously, but either might be done in advance of the other, and the heading of the rivet at one end of the blank might be done aft-er the heading of the rivet at the other end thereof.

As I do not claim herein any particular form of machine for practicing my process, I have not deemed it necessary to show or describe such more fully.

Vhat I claim is- The process herein described of making slotted rivets, consisting in first severing from a piece of Wire or rod a section sufficient in length to form two rivets, cutting therefrom a single piece to sever the section of wire and form therefrom the bodies and points of two slotted rivets, and upsetting the ends of the section of wire to form the heads of the rivets, substantially as shown and described.

CHARLES XV. KING. lVitncsses:

WM. A. MACLEOD, ROBERT WALLACE. 

